I don't speed-solve mirror blocks or "bump cubes" at all, but this is a very solid puzzle to mess with casually. I write this after having both this puzzle and a GAN Mirror M. If you don't want to spend more money for the (admittedly very useful) magnets and the dark coloring of the GAN Mirror M, I'd recommend this one. I love both mirror cubes, but I still cube with this one from time to time, because its brighter and shinier appearance helps me see it better.

Let's start with the good parts: Pretty smooth turning, as long as the layers are aligned of course. It can corner cut 45 degrees (in relation to center rotation) some sides, though others cut less depending on the pieces. Still' cuts more than others from what I seen however. Why cutting varies has to do with the way the pieces interact with each other as larger ones tend to cut easier than smaller ones, not really the side tensions like it would be on evenly-proportioned puzzles. Reverse cutting is about as much roundness as a piece has since it can't have any sort of internal curves due to how the pieces being such different proportions. Though the curves are enough to prevent pieces from catching unless they are misaligned to a large enough degree. It also doesn't pop as long as the tensions aren't too loose, like most any puzzle nowadays. The spring power is also just right as it's fast, yet not uncontrollable. It also comes pre-lubed so you don't have to use any for a while unless you want more or a different feeling kind of course.

Now for the couple of bad parts: The varied proportions of the pieces catching on your fingers coupled with there being no sort of internal corner-twist prevention mechanism means it corner twists a lot. If you want to tension it, which I bet you will, then you will also have to remove (and probably inadvertently mar like I did) a sticker on the thinnest side as the cap is embedded UNDER the sticker rather than being the entire top. The rest have normal caps. Though I really don't like the stickers anyway. The edges catch on your fingers a lot (not even just your fingernails) and chip up. The brush marks that are all too common on mirror cubes are also present here, which I hate because even when you have it solved (all sides flat), it may not look solved because centers may be rotated and thus shine differently. I don't know why most mirror blocks have these sorts of stickers anyway as they don't even look "mirrored" and just make you do a center-rotation algorithm on a non-supercube to make it look right. I'd remove the stickers entirely and make it all black, but the thinnest side would look even more "marked" than having a marred sticker because of that single below-surface cap.

This mirror cube turns so smoothly that I didn't here a sound. It is worth the price and is a fun cube to solve. I wouldn't say this is a very hard cube since it uses most of the regular 3x3 algorithm. The pieces are steady and the stickers are very high quality. The cube looks so cool when it is scrambled and it almost looks like something from minecraft. Overall a very fun cube to solve and to fiddle around with.

It’s a great mirror blocks but it sounds like broken glass turning kind of ironic

This puzzle is a blast. There are a couple of ways to solve it which make it especially challenging. As my first shape mod, I feel like it definitely wont be my last.

The cons are the stickers are not great quality or placed on the cube very well, so that is a little annoying. After playing with this cube for a weekend the stickers are already starting to peel. The spring sounds are also pretty loud out of the box.

For the price it is still a ton of fun and I would definitely recommend.

★★★
★★

MFJS Mirror Cube

Very amazing very smooth worth the price

Rootb the cube was pretty tight, but after playing with it for a little bit, it became a lot better.

Guys, you need to get this puzzle! I got it because I like to collect the Mofang Jiaoshi puzzles. The turning is excellent and very satisfying, but most noteworthy, the design is not like the Shengshou mirror cube. This one has two corners that are unique and then groups of differing numbers of corners and edges that are the same exact shape but with differing grain cuts so solving this cube is actually quite a challenge. You will encounter false equivalency of corners and edges, and it really is tricky figuring out the last layer. You will not be sorry you bought this cube.